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st: RE: help in obtaining a bar graph


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: help in obtaining a bar graph
Date   Wed, 13 Aug 2008 17:34:07 +0100

First, one rough solution. Then, a few comments. 

The following is one line. 
 
twoway scatteri  
`=166/528' 1  `=4569/8781' 2 `=362/528' 4  `=4212/8781' 5, 
recast(bar) barw(0.5) 
xla(1 "frog" 2 "toad" 4 "newt" 5 "snake" 
1.5 `" " " "stuff" "' 4.5 `" " " "nonsense" "', noticks) 
base(0) xtitle(category) ytitle(fraction) yla(0(0.1)0.7, ang(h)) 

Advice often given on Statalist is to give up on -graph bar- when it
does not offer a solution and to build up your own alternative using
-twoway bar-. One of the more puzzling aspects of -graph- initially is
that -graph bar- and -twoway bar- can produce quite similar graphs but
are nevertheless totally different commands. The trick is not to try to
understand this, but just to get used to it. 

In the above I didn't try a direct attack. I use -twoway scatteri- to
say exactly where I want the bars, strictly data points as yet.
Macro-like elements like `=166/528' instruct Stata to work out cell
fractions on the fly. Then I -recast()- to bars. The rest is standard
-twoway- technique. I have not tried to work out from Rich's colourless
terminology -- perhaps protecting a client! -- what the best axis labels
and titles should be but used filler terms. 

There is enormous scope for tuning all the cosmetic aspects. 

No doubt this could be automated more. 

Nick
n.j.cox@durham.ac.uk 

Richard Goldstein

I have two variables defined as shown in the following table:

            |         event
      type1 |         N          Y |     Total
-----------+----------------------+----------
          N |     4,403        166 |     4,569
            |     53.35      31.44 |     52.03
-----------+----------------------+----------
          Y |     3,850        362 |     4,212
            |     46.65      68.56 |     47.97
-----------+----------------------+----------
      Total |     8,253        528 |     8,781
            |    100.00     100.00 |    100.00


I want a bar graph showing 4 bars as follows:
166/528 and 4569/8781
362/528 and 4212/8781

I.e., I want the Y and Total columns rather than the N and Y columns.

I have no idea how to get this and any help/ideas would be greatly 
appreciated.

Note that I can live with having 6 bars (2 for the N column in addition)

if I have to.


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